xrtdac

For some reason to the high rpm ranges, around 5800rpm my obd2 car with hondata seemes to get a lean spike. but then comes back down to stoich. its all gravy till it hits that point. Any theories?

current possible solutions we have done but not tested yet:
installed walbro in-tank fuel pump and removed the stock one with the msd in line fuel pump.

got all the vac lines shortened for efficiency of them. Made them so they weren't extra long or anything.

Had valves adjusted.

xrtdac

by the way,

running DSM 450's on it as well.

highmilehatch

Whats your whole setup?

xrtdac

Drag gen 3 turbo kit, greddy evo exhaust. We have good A/F until 6K where it spikes up then comes back down.

shermanyang

iTrader: (1)

did you get it tuned yet? if not then that's your best bet. my opinion with hondata is tune and leave it alone. little changes can cause headaches.

Spunkster

1) The DSM injectors may be causeing this problem, as they are known to sometime run very inconsistantly

2) Try tuning the issue out...You have a fully programmable ECU, it should not be too hard to find exactly where more fuel needs to be added.

xrtdac

I am sitting right now on this comp with my car on the dynojet. we have it tuned decently right now except for that spike. at 5K its fine and then at 6 k it is at a peak spike of 14.5 but then comes back down. As of right now we have Elite and Payn technologies trying to solve this. Any thoughts from HT would be greatly appreciated here. The injectors seem to be ok cause if they were bad why would they only spike at one RPM? We even threw a lot of fuel at the 6K mark to see if that did anything and it didn't.

xrtdac

Beuler...Beuler........Beuler............

Mr. Softee

is the map voltage changing at all at that rpm?

xrtdac

Is there a way to tell that with the s100?

xrtdac

tried different injectors (RC550) and also then tried different resistors.

Spike has gotten higher.

xrtdac

Anyone? Well now we are down to guessing about the fuel delivery stuff.

There is a walbro in-tank fuel pump as well right now.

Gonna go change the fuel filter to see if that does anything. It probably wont but its just another thing to chalk off the list of what might be an issue.

xrtdac

problem solved so far. Not fully but way safer running.

1.8t

What kind of numbers did you end up putting down?

xrtdac

Nothing special yet. Last season we made 231.4HP with 204 lb ft on 9psi. All stock motor LS with drag gen 3 and some other misc stuff. S-AFC to tune.

Now it is a built LS, 1.9L with hondata. lower compression and we hit 200 on PSI with not even tuning it yet. We jsut were getting the AF curvers into safe areas first. Today we will go tune crazy and get some numbers. todays goal is 300HP to the wheels on pump. 400HP to the wheels on race gas.

DIRep972

iTrader: (1)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by xrtdac &raquo;</TD></TR><TR><TD CLASS="quote">For some reason to the high rpm ranges, around 5800rpm my obd2 car with hondata seemes to get a lean spike. but then comes back down to stoich. its all gravy till it hits that point. Any theories? </TD></TR></TABLE>

You should never be stoich on a boosted car. You need to be rich. what are ur a/f's being tuned too?

xrtdac

AF is now perfect. AF is very steady at a lil below 12.

thrty8street

iTrader: (7)

i thought you couldnt put hondata on a car using an obd2 computer? i thought you had to convert to obd1 first?

xrtdac

don;t need to convert anything other than the harness.

Found a boost leak as well. Fixed that and now we have found that my exhaust is too restrictive.

What will be up for sale is a 2.5" Downpipe, and the 2.5 test pipe and connection flex to a greddy Evo cat back exhaust. I need a 3" downpipe and 3" from there all the way back.

shermanyang

iTrader: (1)

hey is your evo cat back exhaust for a hatch? if it is i'll be glad to take it off your hands. and i'm also local

xrtdac

Unsure if it will work. but if it does that would probably be cool. its on my integra LS.